Manage Control Plane Configuration with decK

You can manage control planes in your Kong Konnect org using configuration files instead of the GUI or admin API commands. With decK, Kong’s declarative configuration management tool, you can create, update, compare, and synchronize configuration as part of an automation pipeline.

In Kong Konnect, decK can manage control planes and all of their configurations:

Create state files for different control planes and manage each one separately.
Manage Gateway entities for each control plane.
Migrate configuration from one control plane to another.

One way to learn decK or write a decK file is to view the YAML generated files in Konnect. Konnect autogenerates a YAML configuration file that reflects the current Gateway Manager configuration. You can view and copy the current configuration on the Configuration tab of each entity in Gateway Manager.

Use a --konnect-prefixed CLI flag or pass Konnect parameters using a decK configuration file (~/.deck.yaml by default) to target https://cloud.konghq.com. If you don’t pass any Konnect parameters to decK, decK looks for a local Kong Gateway instance instead.

Run deck help to see all available flags, or see the decK CLI reference.

You cannot use decK to publish content to the Dev Portal, manage application registration, or configure custom plugins.

Prerequisites

decK v1.40.0 or later installed.
Optional: To test your configuration, set up a simple data plane node.
A personal access token (PAT).

Test your connection

Check that you can log in to Konnect and that decK recognizes your account credentials:

deck gateway ping \
  --konnect-control-plane-name default \
  --konnect-token {YOUR_PERSONAL_ACCESS_TOKEN}

If the connection is successful, the terminal displays the full name of the user associated with the account:

Successfully Konnected to the Example-Name organization!

You can also use decK with Konnect more securely by storing your personal access token in a file, then either calling it with --konnect-token-file /path/{FILENAME}.txt, or adding it to your decK configuration file under the konnect-token option:

konnect-token: {YOUR_PERSONAL_ACCESS_TOKEN}

The default location for this file is $HOME/.deck.yaml. You can target a different configuration file with the --config /path/{FILENAME}.yaml flag, if needed.

The following steps all use a .deck.yaml file to store the Konnect credentials instead of flags.

Create a configuration file

Capture a snapshot of the current configuration in a file:

deck gateway dump --konnect-control-plane-name default -o konnect.yaml

If you don’t specify the --konnect-control-plane-name flag, decK will target the default control plane. If you have more than one control plane in your organization, we recommend always setting this flag to avoid accidentally pushing configuration to the wrong group.

The command creates a file named konnect.yaml. If you have nothing configured, decK creates the file with only the format version and control plane name:

_format_version: "3.0"
_konnect:
  control_plane_name: default

You can specify a different filename or location, or export the configuration in JSON format:

deck gateway dump --konnect-control-plane-name default \
  --format json \
  --output-file examples/konnect.json

Make changes to configuration

Make any changes you like using YAML or JSON format. For this example, let’s add a new service.

Add the following snippet to your konnect.yaml file:

 _format_version: "3.0"
 _konnect:
   control_plane_name: default
 services:
 - name: MyService
   host: httpbin.konghq.com
   port: 80
   protocol: http
   routes:
   - methods:
     - GET
     - POST
     name: mockpath
     paths:
     - /mock
     plugins:
     - name: key-auth
       config:
         key_names:
         - apikey

This snippet defines a service named MyService pointing to httpbin.konghq.com. The service has one version, and the version gets implemented with the route /mock, which means that you can access the service by appending this route to your proxy URL.

Because you’re also enabling the key-auth plugin on the route, you need a consumer key to access it, so you can’t test the route yet.

Compare your local file with the configuration currently in Kong Konnect:

 deck gateway diff konnect.yaml --konnect-control-plane-name default

If the format and schema is correct, decK gives you a preview of what would be added to the Kong Konnect configuration:

 creating service MyService
 creating route mockpath
 creating plugin key-auth for route mockpath
 Summary:
   Created: 3
   Updated: 0
   Deleted: 0

If you’re satisfied with the preview, sync the changes to Kong Konnect:

 deck gateway sync konnect.yaml --konnect-control-plane-name default

You should see the same output again:

 creating service MyService
 creating route mockpath
 creating plugin key-auth for route mockpath
 Summary:
   Created: 3
   Updated: 0
   Deleted: 0

Check Kong Konnect to make sure the sync worked. Open Gateway Manager, select your control plane, and select Gateway Services.

You should see a new service named MyService in the control plane.

Manage consumers and global plugins

You can also use decK to manage objects not tied to a specific service or route. For this example, create a consumer and a global proxy caching plugin:

Consumers represent users of a service, and are most often used for authentication. They provide a way to divide access to your services, and make it easy to revoke that access without disturbing a service’s function.
Global plugins are plugins that apply to all services, routes, and consumers in the control plane, as applicable. For example, you can configure proxy caching on all your services at once with one proxy-cache plugin entry.

In the previous section, you created a route with key authentication. To access this route, add a consumer to the konnect.yaml file and configure a key:
```
 consumers:
  - custom_id: consumer
    username: consumer
    keyauth_credentials:
    - key: apikey
```

Enable proxy caching so that your upstream service is not bogged down with repeated requests. Add a global proxy cache plugin:

 plugins:
 - name: proxy-cache
   config:
     content_type:
     - "application/json; charset=utf-8"
     cache_ttl: 30
     strategy: memory

Run a diff to test your changes:

 deck gateway diff konnect.yaml --konnect-control-plane-name default

If everything looks good, run another sync, then check Kong Konnect to see your changes:
```
 deck gateway sync konnect.yaml --konnect-control-plane-name default
```

Test the service

If you have already have a data plane node deployed, you can test this configuration now. Or, you can start a new data plane node using the Docker quick setup script.

The default proxy URL is localhost:8000.

Make a call to the proxy URL and append the route path /mock with an apikey header:

 curl -i -X GET http://localhost:8000/mock \
  -H 'apikey: {API_KEY}'

If successful, you should see the homepage for httpbin.konghq.com. On the Service Version overview page, you’ll see a record for status code 200.

If you try to access the route without a key, you’ll get an authorization error:

Kong Error
No API key found in request.

Migrate configuration between control planes

You can also use decK to migrate or duplicate configuration between control planes.

Export configuration from the original control plane with deck gateway dump into a state file:

 deck gateway dump \
   --konnect-control-plane-name default \
   --output-file default.yaml

In the file, change the control plane name to the new group:

 _format_version: 3.0"
 _konnect:
   control_plane_name: staging

Using the state file you just edited, preview the import with the deck gateway diff command, pointing to the control plane that you want to target:
```
 deck gateway diff default.yaml \
   --konnect-control-plane-name staging
```
If everything looks good, deck gateway sync the configuration to the new control plane:
```
 deck gateway sync default.yaml \
   --konnect-control-plane-name staging
```

You should now have two control planes in Konnect with the same configuration.